W. George Schmid in his
Hosta Species Update on The Hosta
Library (2007) says that "Both
H. nigrescens and H. ‘Tenryu’ have a tendency to
sport to yellow or variegated forms. A yellow form is
listed in Europe as H. nigrescens ‘Aurea’, a cultivar
name invalid according to the rules of the ICNCP and
should it be called H. ‘Ogon Kuro’."
Mikiko Lockwood in an article on The Hosta Library titled,
A Little About Japanese Hosta Terms defines the term ogon or oogon as gold or yellow.
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